Machines that rely on heat to install inserts use one of two approaches. In some, a metal tip transfers
heat to the insert. In the others, inserts are preheated and pneumatically pressed into predrilled holes in
the plastic. In both approaches, inserts are pushed into the plastic by a controlled force, usually less than
50 lb. Heat installation also requires the entire insert be heated, not just the metal-plastic interface. So
for proper installation, inserts should have enough thermal conductivity so that plastic around the insert
quickly heats and melts.